Apparatus for and method of drawing sheet glass



APPLICATION FILED ]UL Y|0.1920.

Patented Nov. 21, 1922.

4 SHEETS-SHEET I.

A. E. FOWLE AND J. P. CROWLEY.

APPARATUS FOR AND METHOD OF DRAWING SHEET GLASS.

A P P L I C A T l 0 N F l L E D J U L Y 1 0 I 9 2 0.

1.4535358. Patented Nov. 2L 1922,,

4 EEEEE S' EEEEE 2- ammo/:

A. E. FOWLE AND J. P. CROWLEY.

APPARATUS FOR'AND METHOD OF DRAWING SHEET GLASS.

APPLICATION Fl LED JULY 10. I920.

Patented Nov. 211, 1922 4 SHEETSSHEET 3;

A. E. FOWLE AND J. P. CROWLEY.

APPARATUS FOR AND METHOD OF. DRAWING SHEET GLASS. APPLICATION FILED JULY.10. 1920.

1,485 958 Patented Nov. 21, 1922.

4 SHEETSSHEET 4- I l I II IL I I lwuawtozs Yfka/r 45, 7 600642 J0Ae o% 7? areal/Key ,1 mMJM/W sheet. The roll 0 has its surface highly poland the ortion H of the slab between the portions and J and will supply the glass for the auxiliary mass or pool below the heated chamber K. After the drawing of the sheet is established, (by the use of a bait, as has been the practice heretofore) a portion of the glass forming this sheet will be drawn from the top surface of the mass on the slab H beneath the heated chamber F while. another portion will be drawn from the top surface of the auxiliary mass on the slab J beneath the heated chamber K. The coolers M and N will sufficiently chill the surface, so that it can be drawn and the portion which is turned from the lower level will be drawn upward and about the cooled idler roll 0, thereby forming the lower surface of the ished and maintained at such a temperature that the glass will not adhere thereto, but will be drawn off and over the carrier rolls Q to the drawin table R.

With the modified construction shown in Figure 2, the arrangement of the upper and lower masses on the slabs H and J is substantially the same; but instead of placing the roll 0 and the plane of the drawing table below the level of the mass on the slab. H, they are arranged somewhat above the level thereo This will cause an upward drawing of the glass, which forms both the upper and .lower surface of the sheet. In Figure 3 the arrangement is the reverse, the roll 0 and the plane of the drawing table being considerably below the level of the glass on the slab H, but above the level of the glass on the slab J. Therefore, the glass forming the upper portion of the sheet will flow downward glass forming the lower portion of the sheet will be drawn upward.

To supply the necessary heat in the chambers F and K, gas burners, or other heating means, indicated at S and T, may be employed and burners U are provided for supplying heat in the chamber I. There is also arranged a burner V above the sheet after it is passed beyond the roll 0 for suitably softening the same.

To maintain the proper quantity of glass at the lower level, so as to supply that drawn in the formation of the sheet and to avoid any overflow, any suitable means provided. One method of regulating the amount is to adjust the roll 0 towards or from the slab H, thereby altering the de th of the down-flowmg stream which supp ies the lower level.

Another method is shown in Figure 4, in which the glass is by streams which are separate from the portion from which the sheet is drawn. Thus as shown in Iigure 6, the tile W forming the upper slab the lower slab J and the vertical connectin portion H is provided with side channels may be,

supplied to the lower level th separated from the portion f in use. With this construction the quantity of glass which flows through the central channel all may be regulated so as to suppl that is required for the upper portion of sheet, but insuflicient for mass at the lower level.

the maintaining the The additional .quantity may then be regulated by varying the position of the gates X, which will increase or diminish the size of the streams flowing through the channels W.

It will be observed that in the construction shown in Figure 4, the sheet is drawn laterally from a vertically extending mass and that the effect is-substantially the same as where the sheet is drawn vertically from a horizontal mass, while at the same time it avoids the necessity of changing the direction of drawing or the use of a bending roll.

What we claim as our invention is:

1. The method of forming sheet glass,

comprising the drawing of the opposite sur- 4. The method of forming sheet lass,

comprising the drawing of portions oIming the opposite surfaces thereof from pools ofmolten glass arranged at different levels with a flowing COIIDGC'iZlOII- bGtWQGII theupper and lower..level.

5. The method of forming sheet glass, comprising the drawing ofportlons forming the opposite surfaces thereof fromv pools of molten glass arranged at diiferent-levels having a fiowingconne'ction there-between," the portion forming the lower surface of the sheet being derived from the surface of the lower pool and drawn upward over "the surface of the flowing connection.

6. The method of forming sheet glass, comprising the drawing of portions forming e opposite surfaces thereof from the surface portions of pools of molten glass arranged at different levels and connected by a vertically extending portion.

7. The method of forming sheet glass, comprising the drawing of the sheet laterally rom a vertically extending mass of plastic glass the vertically extending mass being constantly renewed from both its upper and lower ends.

8. The method of forming sheet glass, comprising the drawing of the sheet laterally from two pools of molten glass arranged at different levels.

9. The method of comprising the drawing of the sheet laterally from a vertically extending mass of plastic glass, which connects pools of molten gla$ at two different levels, the glass forming the lower surface portion of the sheet being drawn from an upwardly moving surface portion of said vertical mass, and applying glass to the pool at the lower level in regulated quantities.

10. In an apparatus for drawing sheet glass, means for supporting a vertically extending mass of plastic glass, separate pools of molten glass for feeding this mass at both itsupper and lower ends, and means for drawing the sheet laterally from thevertically extending mass.

11. An apparatus for drawing sheet glass comprising means for flowing a stream oi plastic glass from an upper to a lower level, and means for drawing the entire sheet laterally from an intermediate portion of said flowing stream.

12. In an apparatus for drawing sheet forming sheet g as glass, two receptacles for plastic glass arranged at different levels, and connecting means therebetween for a flowing stream of glass, and means arranged above the level of the lower receptacle for the lateral drawing'of a sheet from the connecting stream.

13. lln an apparatus for drawing sheet glass, two 'heated receptacles for plastic glass arranged at different levels with a heated slab therebetween, stream of glass flows from one receptacle to the other, and means arranged above the level of the lower receptacle for drawing a sheet laterally from said stream.

14. In an apparatus for drawin sheet glass, two receptacles for plastic gass arranged atdifi'erent levels and having a connecting slab therebetween, over which a stream of glass flows from one receptacle to the other, heating chambers above portions of each of said receptacles, cooling means for the surface of the glass beween said heating chambers, and means arranged above the level of the lower receptacle for drawing a sheet laterally from the stream between re ceptacles.

In testimony whereof we aflix our signatnres.

ARTHUR E. FOWLE. JOSEPH P. CROWLEY.

over which a. 

